Flash Player installation will not complete. Install file starts but stops with connection error. Windows XP on a PC. Firefox 38.0.1.

[Guest]

I DL the installer.

Run it from download file

Starts to installl, then stops.

Displays a a connection error.

Install won't complete

[jeromiec83223024 · Accepted solution]

If you don't have Service Pack 3 installed, you may run into SSL connection problems.  WinXP SP2 and lower lack support for the secure cryptographic schemes used in 2015.

The troubleshooting guide below should help.  Try the links to the offline installers at the bottom of the guide.

Installation problems | Flash Player | Windows